fix(@ngtools/webpack): normalize file replacement paths
fix(@ngtools/webpack): normalize file replacement paths

To ensure file replacements match properly, the paths now have their directory separators normalized before comparing.

ocombe/angular-cli,geofffilippi/angular-cli,catull/angular-cli,clydin/angular-cli,Brocco/angular-cli,ocombe/angular-cli,catull/angular-cli,angular/angular-cli,clydin/angular-cli,geofffilippi/angular-cli,ocombe/angular-cli,angular/angular-cli,Brocco/angular-cli,geofffilippi/angular-cli,geofffilippi/angular-cli,catull/angular-cli,catull/angular-cli,angular/angular-cli,angular/angular-cli,Brocco/angular-cli,ocombe/angular-cli,Brocco/angular-cli,clydin/angular-cli,ocombe/angular-cli,clydin/angular-cli,Brocco/angular-cli